Lazarus Pascal

Examine HTTP Response Status Code and Text

See more REST Examples

Demonstrates how to examine the HTTP response status code and text when using the REST object. Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Rest;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rest: TRest;
  bTls: Boolean;
  port: Integer;
  bAutoReconnect: Boolean;
  responseText: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  rest := TRest.Create;

  //  We're going to check https://authenticationtest.com/HTTPAuth/
  bTls := True;
  port := 443;
  bAutoReconnect := True;
  success := rest.Connect('authenticationtest.com',port,bTls,bAutoReconnect);
  if (success <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  Send a GET request
  responseText := rest.FullRequestNoBody('GET','/HTTPAuth/');
  if (rest.LastMethodSuccess <> True) then
    begin
      WriteLn(rest.LastErrorText);
      Exit;
    end;

  //  The start line of an HTTP response, called the status line, contains the following information:
  //  
  //      The protocol version, usually HTTP/1.1.
  //      A status code, indicating success or failure of the request. Common status codes are 200, 404, or 302
  //      A status text. A brief, purely informational, textual description of the status code to help a human understand the HTTP message.
  //  
  //  A typical status line looks like: HTTP/1.1 404 Not Found.

  //  The ResponseStatusCode property contains the integer response code:
  WriteLn('Response status code = ' + rest.ResponseStatusCode);

  //  The ResponseStatusText property contains the text (if any) that follows the status code on the status line.
  WriteLn('Response status text = ' + rest.ResponseStatusText);

  //  In this case, the sample output is:
  //  
  //  Response status code = 401
  //  Response status text = Unauthorized


  rest.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.